The next major attempt to prosecute war criminals occurred in Europe and Asia after World War II. Throughout the war, the Allies had cited atrocities committed by the Nazi regime of Adolf Hitler and announced their intention to punish those guilty of war crimes. The Moscow Declaration of 1943, issued by the United States, Great Britain, and the Soviet Union, and the Potsdam Declaration of 1945, issued by the United States, Great Britain, and China (and later adhered to by the Soviet Union), addressed the issue of punishing war crimes committed by the German and Japanese governments, respectively.

At the war’s conclusion, representatives of the United States, the United Kingdom, the Soviet Union, and the provisional government of France signed the London Agreement, which provided for an international military tribunal to try major Axis war criminals whose offenses did not take place in specific geographic locations. This agreement was supported by 19 other governments and included the Nürnberg Charter, which established the Nürnberg tribunal and categorized the offenses within its jurisdiction. The charter listed three categories of crime: (1) crimes against peace, which involved the preparation and initiation of a war of aggression, (2) war crimes (or “conventional war crimes”), which included murder, ill treatment, and deportation, and (3) crimes against humanity, which included political, racial, and religious persecution of civilians. This last category included what is commonly called genocide.

The term genocide was coined by the Polish American legal scholar Raphael Lemkin and first appeared in print in his work Axis Rule in Occupied Europe: Laws of Occupation, Analysis of Government, Proposals for Redress (1944). The Convention on the Prevention and Punishment of the Crime of Genocide, adopted by the General Assembly of the United Nations in 1948, defined genocide as including killing or inflicting serious physical or mental injury on members of a national, ethnic, racial, or religious group with the intention of bringing about the group’s destruction, in whole or in part. The convention made genocide an international crime that could be prosecuted in the court of any country. Because the Nürnberg trials preceded the convention, however, Nazi war criminals were not prosecuted for genocide.

The International Military Tribunal in Nürnberg, Germany, tried 22 Nazi leaders, including one, Martin Bormann, who was tried in absentia. The trial was conducted in four languages and lasted nearly 11 months. All but three of the defendants were convicted; 12 were sentenced to death. The remaining defendants received lengthy prison terms, which they served at Spandau Prison in West Berlin. Subsequent trials were held under the auspices of Control Council Law No. 10, which was used to prosecute accused Nazi war criminals whose crimes took place in specific locales.

Japanese defendants accused of war crimes were tried by the International Military Tribunal for the Far East, which was established by a charter issued by U.S. Army General Douglas MacArthur. The so-called Tokyo Charter closely followed the Nürnberg Charter. The trials were conducted in English and Japanese and lasted nearly two years. Of the 25 Japanese defendants (all of whom were convicted), 7 were sentenced to hang, 16 were given life imprisonment, and 2 were sentenced to lesser terms. Except for those who died early of natural causes in prison, none of the imprisoned Japanese war criminals served a life sentence. Instead, by 1958 the remaining prisoners had been either pardoned or paroled.

From their outset, the war crimes trials were dismissed by critics merely as “victor’s justice,” because only individuals from defeated countries were prosecuted and because the defendants were charged with acts that allegedly had not been criminal when committed. In support of the trials, the Nürnberg tribunal cited the Kellogg-Briand Pact (1928), which formally outlawed war and made the initiation of war a crime for which individuals could be prosecuted.

Post-World War II developments

After the Nürnberg and Tokyo trials, numerous international treaties and conventions attempted to devise a comprehensive and enforceable definition of war crimes. The four separate Geneva conventions, adopted in 1949, in theory made prosecutable certain acts committed in violation of the laws of war. The conventions provided for the protection of wounded, sick, and shipwrecked military personnel, prisoners of war, and civilians. Like the convention on genocide, however, the Geneva conventions specified that trials were to be arranged by individual governments. In 1977 two protocols were adopted to clarify and supplement the Geneva conventions. Recognizing that many conflicts were internal rather than international in scope, the second protocol afforded greater protection to guerilla combatants in civil wars or wars of “self-determination.”

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